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Crystal Mystery takes players to a universe of immense riches and mysterious: the famous hidden Eldorado, a city where the streets are paved with gold.

Gold is a major theme in the universe of the game, as the reels are set against a golden background covered in mysterious carvings. The result is quite dramatic and the graphic quality is high despite the relative lack of details in the background.

Crystal Mystery is also a rather quiet game, with only a few retro sound effects playing in the background as you spin the reels. In a nutshell, the game manages to make a strong impact with a few simple elements; a trademark of GameArt creations.

It is important to know the basic rules of any slot game in order to get a good start and customise the settings just the way you want. Crystal Mystery uses a standard gameplay that even beginner players will be able to wrap their heads around in a minute.

The game features five reels with three symbols on each and a total of 10 paylines running in all directions. The paylines are fixed so you will not be able to modify their number. Use the arrows to adjust the size of your bet per line and click the green Spin button to start your next turn. Winning combinations of symbols landing on paylines trigger a cash prize that will be automatically added to your total credit. You can always bet a little extra to increase the size of your potential rewards. Besides, you get a chance to double your winnings by guessing the colour of a hidden card during an optional mini game following every successful spin. A bad guess will take you back to the base game, without your reward.

As usual, the Autoplay feature lets you put the game on autopilot for as long as you like, thus allowing the reels to spin freely. All your wins will accumulate on their own, but you will not be able to play the mini gambling game. You can come back to single-spin mode whenever you like.

The paytable of Crystal Mystery contains nine basic symbols in total, which we can put into two different groups.

The first group contains low-paying symbols inspired by playing card. These icons, from number 10 to the Ace, appear often on the reels in order to give you more chances to line them up on the paylines.

The second group features a Golden Mask, a Moon and Sun Symbol, a Pyramid and a fierce Aztec Warrior. Now things are getting more exciting, with higher cash rewards and plenty of winning possibilities. You can start earning money with as little as two of these symbols lined up.

The true essence of Crystal Mystery lies in its special reel symbol, which we will take a thorough look at now.

This unique icon is a Crystal Skull, and it has several functions. First of all, it can substitute for any other symbol and help you score even more wins. Secondly, it is in itself one of the most valuable symbols of all, and it comes with a Scatter function: no need to worry about paylines, three or more of them anywhere on screen will start triggering cash rewards.

The Skull also trigger a 10 Free Spin Bonus round, during which a basic symbol is randomly selected to expand an cover the whole reel when it appears during the free games.

Crystal Mystery is one of those simple and quite basic free slot games. Both the game universe and the gameplay features are trademarks of the genre, and if you have played other GameArt creations such as the Cleopatra Jewels slot then you will be in very familiar territory.

The Skull is the only special symbol here, and perhaps it would have been a little more interesting to introduce other icons in addition.